Check if a development file for the package is present and install
the corresponding m4 file in aclocal-missing if it isn't.
Add glib, glib-2.0 and gtk-2.0 to the fallback directory.
svn path=/trunk/; revision=6102
That way it should be possible to build tethereal from cvs. Also,
Fallback files may be added to the aclocal-fallback/ directory in case
other optional packages come up.
svn path=/trunk/; revision=6071